import java.util.Scanner;
public class No353 {

	public static void main(String[]args) {
		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int S ;

		a = (-1)*a;
		S = a-b;

		System.out.println(Math.abs(S));
		


	}


}